REPAIR INSTRUCTIONS
Page 261
288
Figure 288 — Valve Yoke
2. Place the valve yokes (4) on the yoke guide
pins from which they were removed for both
inlet and exhaust (early production) or
exhaust only (engine serial No. 0D0120 or
later). Current-production engines use a
pinless yoke at the inlet positions. The
pinless yokes are installed over two inlet
valves with the notch and the elongated hole
facing away from the rocker arm as shown in
Figure 289.
When installing pinless yokes, the end of the yoke
with the two notches must face away from the
valve rocker shaft. If the yoke is installed
incorrectly, it will contact the rocker arm. See
Figure 289.
289
Figure 289 — Proper Assembly of the Pinless Valve Yoke
3. Slightly rock the yokes from side-to-side to
be sure they are seated on the valve stems.
The exhaust valve yokes on engines equipped
with the J-Tech™
engine brake use an actuator
pin assembly, part No. 421GC41M, in place of the
standard yoke adjusting screw. Ensure that the
yokes with actuator pin assemblies are in position
over the exhaust valves.
Rocker Arm and Engine Brake
Installation
[213 LP]
The valve rocker arm assemblies are nearly
identical on non-brake and brake-equipped
engines. There are two differences, however, on
engines equipped with the J-Tech™ engine
brake:
r
Revised adjusting screws with spherical jam
nuts replace the standard adjusting screws
and jam nuts on the exhaust rocker arms.
r
An oil supply screw replaces the locating
screw and lock washer on the rocker arm
mounting bracket.
1. Rocker Arm
2. Yoke Adjusting Screw
3. Jam Nut
4. Valve Yoke
5. Valve Stem
6. Yoke Guide Pin
5_106_00.bk Page 261 Friday, August 4, 2000 11:17 AM
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